Cotton-dyes.



:Be it known-that we,

UNITED STATES PATENT on AUGUST BLANK, CARL HEIDENREICH, AND JO HANNES JANSEN,

ASSIGNORS T FARIBENFABRIKEN VORM. FRIEDR- BAYER & (20., OF ELIBERFELD, GERMANY,

NEAR COLOGNE, GERMANY,

OF LEVERKUSEN,

A CORPORATION OF GERMANY.

sorrow-Imus.

1,082,925, Specification of Letters ream No Drawing.

Application filed March 28, 1018. Serial No. 757,870.

To all whom it mag concern:

AUGUST BLANK, ARL HEIDENREICH, and 'JoHANNEs J ANSEN,

doctors of philosophy, chemists, citizens of the German Empire, residing at Le'verkusen,

near Cologrie-onthe-Rhine, Germany, have invented new and useful Improvements in derivatives,

Cotton-Dyes, of which the following is a specification.

cotton dyes can be obtained bycombining with an azo component, such as resorcin, meta diamins, nietaaminophenol or their the diazo compounds obtainable from the aminobenzoylamino compounds described in United States Letters Patent No. 1012853 having the formula The new products are after being dried and pulverized in the shape of their alkaline salts brownish powders soluble in water generally with a yellowish coloration and yielding upon reduction with stannous chlorid and hydrochloric acid diaminodibenzoyldiaminodiphenylurea-disulfonic acid and red shades. These colors are rendered very fast to washing by after-treatment with formaldehyde of fibers dyed with them.

In order to illustrate the new process more fully the following example is given, the parts being by weight-49.5 parts of para para diaminodibenzoyldiaminodiphenylurea-disulfonic acid (sodium salt) are dissolved in300 parts of hot Water, the

solution-is cooled with ice to 10 (liand diazotized with 50.

parts of hydrochloric acid and 10 parts of diazotation; is finished after stirring for 2-3 hours and the diazo compound added to a cooled solution of 16 arts of resorcin in 700 parts of water contalning 40 parts of Na,CO',. After some time the mixture is heated to 70 C. and the azo dye is salted out.- It is after being dried and pulverized in the shape of its sodium. salt a brown powder soluble in water with an orange-yellow coloration;v in caustic soda lye with a'yellowish-red coloration; and being soluble in We have found that new andvaluable.

yellow to orangesodium nitrite. 'The' soluble in water with an concentrated sulfuric acid of 66 B. with a I yellowish-brown coloration. It has in a free state most probably theformula:

on NH.C H .(S0 H)NHC0.CeH4-N N-G|;Ha 0g 00 on B\OH Upon reduction with 'stannous chlorid and hydrochlorlc acid para-para-diaminodibenzoyldiaminodiphenylurea-disulfonic acid and aminoresorcin are obtained. It dyes cotton in bright yellow shades, which are "rendered fast to Washing by treatment with formaldehyde.

An orange dye is obtained from para-paradiaminodibenzoyldiaminodiphenylurea disulfonic acid and meta-phenylenediamin and a yellowv product from meta-aminophenol.

Other of the above mentioned products can be used.

1.: The herein described new azo dyestufis being azo dyes obtained from diaminodibenzoyldiaminodiphenylurea disulfonic acid; which are after being dried and pulverized in the shape of their alkaline salts brownish powders soluble in water generally with a yellowish duction with stannouschlorid and hydrochloric acid diaminodibenzoyldiaminodiphenylurea-disulfonic acid and an amin; dyeing cotton ellow to orangered shades which are ren ered fast to Washing by an after-treatment with formaldehyde, substantially as described.

coloration and yielding upon re- Patented e se, rare.

2. The herein-described newazo dyestufl 1 which has in a free state most probably the formula:

I on

NH.(kH .(SO;H)-NHCO.CnH4-N-=N CeHI 011 cc which is after being dried and pulverized in the shape of its sodium salt a brown powder orange yellow coloration; in can t soda lye with a yellow i'sh-red coloration"; being soluble in c0ncentrated. sulfuric -acid of66 Bdwith a yels raminoresorcin; dyeing cotton in bright yel- 10W shades, fast to Washing by an aftertrezitment with formaldehyde, 'substantially as described.

In testimony whereof we have hereunto set our hapds in the presence of two Slib- 10 scribing witnesses.

AUGUST BLANK. [w]

CARL HEIDENREICH. Lg-8;

JOHANNES 'JANSENT 1. s1 Witnesses:

HELEN Norm, ALBERT NUFER.

Gopies of this patent may be obtained for five cents each, by addressing the f Commissioner o'iistents,

' Washington; D. 0. 

